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i wards designate the point which I believe to be new therein.

WILLIAM W.;OHIPMIN, OF BROOKLYN, NRW YORK, ASSIGNOR To RIMSELF AND W. D. GOOKIN, OR NEW YORK o-ITY..

`Letters Patent No. 75,861, dated March 24, 1868.

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v Be it known4 that I, WILLIAM W. CHIPMAN, of Brooklyn, in the county of Kings, land State of New York: have invented certain new and useful AImprovements in the Manufacture of Whiting and `Ifaris-White; and I do Vhereby declare that the following is a full and exact description thereof.

My invention allows the manufacture of a.v purer article than usual, and at loss eKpense. I will first proceed to describe what I consider the best means of'carrying out my invention, and will after- I takcgood limestone, (carbonate of Iim'e,) by preference that from the quarry7 at Missisquoi, in the `State of Vermont,V though I believe any good lime willserve about as well, and burn it in a kiln in the ordinary man-` no1-.1A I then slack 1the vquick-lime thus produced, and add so much water, (I have used the Coclrituate water at Bostoin) in my experiments, as will form a thick duid, having aV consistency about like cream. I I now let this stand for-several hours,'to allow all the-foreign and gritty matter vto subside. I thon lead it into a tank, and blow up'through it carbonio-acid gas, for some days or weeks, constantly agitating it by a wheel, after the fashion of a dairy-churn, until the water ceases to-give any appreciable alkaline reaction tothe taste. The particles of limo are now again fully supplied with carbonio acid, and are then carbonate of lime, substantially the same article, chemically, as while it lay in the form of rockin the earth, but exceedingly comminnted and void of foreign matter. It remains now to dry the mass byrordinary means, and the result isl a. Whiting or IarisWhite, made without grinding, yet as ne as the act of dissolving in water can make it. l

This may be used for all the purposes for which ordinary whiting or Iaris-white is used, with the same orv a 'better effect.

The accompanying figure represents :rn-outline or sketch ofthe apparatus whichIpropose to employ in the manufacture.

I may remark, that in my experiments, I have used carbonio-acid gas made by ordinary chemical means, treating marblcfdust with sulphuric acid, and have realized only `such degree of heat in my'agitating-vessel as is duc to the chemical action, butI believe'that the means sketched will he found equivalent in practice.

A is a closed furnace, in which'anthracite is burnedislowly, vthe early gaseous emissions havingbeen v,allowed to escape freely into the atmosphere. 'Ihe later gases, composed largely of carbonio acid, are cooled by the presence of water, either byconducting them through ai long pipe or series of pipes, B, or, if preferred, by blowing them up through water, and finally blown up at a reasonably reduced temperature through the agitated lime-water in the vessel C. I have represented the agitator by l). t may bc turned by a belt or gearing 'from a steam-engine, the heat from which may be derived from the gases in the process of cooling before referredl to. The same steam-engine, not represented, by means of a suitable pump or powerful blower, may force in the continual supplyof fresh air required to maintain the combustion and supply the constant currcntof gases. 'Ihe ccnl may hc addedv to the re through a double door or loc-k, after being partially burned in another chamber,

Some of the benefits of my invention may be obtained byv slaking the lime to a powder, instead of its being suspended in water, and the carbonio acid 'gas may be applied while in that powdery state, but I much prefer` thcsuspension in water, as described.

IIaving now fully -described my invention, what I claim as new therein, and desire to4 secure Vby Letters Iatcnt, is as follows: I

I claim the within-dcscribed process of manufacturingIarisfwhitc and Whiting from limestone, by the three several steps of burning, slaking, and rccarbonizing, substantially as and for the purposes herein set forth.

In testimony' whereof, I have hac'reunto set my name in presence of twosubscrihing witnesses.

W. W. OHIPMAN.

Witnesses:

W. C. DRY, THOMAS D. SruTsoN, 

